/********************************************************************
        File :			StopWatch.h
        Creation date :	2010/6/27
		
        License :			Copyright 2010 Ahmed Charfeddine, http://www.pushframework.com

                                   Licensed under the Apache License, Version 2.0 (the "License");
                                   you may not use this file except in compliance with the License.
                                   You may obtain a copy of the License at
				
                                           http://www.apache.org/licenses/LICENSE-2.0
				
                                   Unless required by applicable law or agreed to in writing, software
                                   distributed under the License is distributed on an "AS IS" BASIS,
                                   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
                                   See the License for the specific language governing permissions and
                                   limitations under the License.
	
	
 *********************************************************************/
#ifndef StopWatch__INCLUDED
#define StopWatch__INCLUDED

#pragma once


namespace PushFramework {

    class StopWatch {
    public:

        StopWatch() {

            gettimeofday(&tvBegin, NULL);

        }

        ~StopWatch(void) {
        }

        double GetElapsedTime(bool bStart = true) {
            timeval tvEnd, tvDiff;
            gettimeofday(&tvEnd, NULL);

            timeval_subtract(&tvDiff, &tvEnd, &tvBegin);


            double sec = tvDiff.tv_sec;
            double usec = tvDiff.tv_usec;

            return sec + 1000000 / usec;


        }
    private:
        timeval tvBegin, tvLast;

        int timeval_subtract(struct timeval *result, struct timeval *t2, struct timeval *t1) {
            long int diff = (t2->tv_usec + 1000000 * t2->tv_sec) - (t1->tv_usec + 1000000 * t1->tv_sec);
            result->tv_sec = diff / 1000000;
            result->tv_usec = diff % 1000000;

            return (diff < 0);
        }

    };

}

#endif // StopWatch__INCLUDED
